Electron affinity: s- and p-block

THe electron affinity is the nergy required to detach an electron from the singly charged negative ion (energy for the process X -> X + e). The equivalent more common definition is the energy released (Einitial+ Efinal) when an additional electron is attached to a neutral atom or molecule. [IUPAC Compendium of Chemical Terminology (Gold Book), 2nd Edition (1997)]